[Postfixbuch-users] How to handle usernames?

[bloocrew.com]

Hi there,

I´ve got a strange behaviour which I want to get rid off ... though it may
not be the right group here:

on a suse linux 8.1 box, doing

useradd -s /bin/false -d /... and-so-on ... b.richards

to add a mailuseraccount, I always got the reply:

invalid username

The same with

useradd -s /bin/false -d /... and-so-on b\.richards

OK, then I´m typing ³useradd brichards², editing the /etc/passwd as well as
/etc/shadow (e.g. setting in the dot manually), then typing in the password,
but then ... the client sometimes gets an errormessage from postfix -
sometimes it works fine.
I found out that in case of unvalid usernames always almost a ³!² is shown
in the second field in /etc/shadow-uservalue-lines (where there have to be
the shadowed password).

everything works fine with usernames without a dot.

I tried hard to find some informations about this, but the only restriction
valid for all shels seemed to be avoiding ³:² and ³/² in usernames.

Anyone a suggestion? would be helpfull... thanx a lot!

greetings

Btw: how can I change the length of a password to a value higher than 8?
Possible at all on a bash or tcsh?

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